Takes a string, be it statically const or not, and makes an 8-byte long

cyclicStrToLong.cpp

#include <iostream>
using namespace std;

unsigned long attrID2(const char * ls){
   const unsigned long golden = 0x9E3779B97f4A7C15;
    unsigned long result = 0;
    int offset = 0;
    for(int i=0; ls[i] != 0; i++,offset = (offset + 1) % sizeof(long)){
        const unsigned long p = ((long)ls[i] << (offset*8));
        const unsigned long p2 = ((long)1 << (i%(sizeof(long)*8))) & golden;
        result = ~0 & (result ^ p ^ p2);
    }
    return result;
}

unsigned long constexpr attrID3(const char * ls, long val = 0, unsigned int depth = 0, unsigned int offset = 0) {
    return *ls
        ?
        attrID3(ls+1,
                ~0 & (val ^ ((long)*ls << (offset*8)) ^ (((long)1 << (depth%(sizeof(long)*8))) & 0x9E3779B97f4A7C15)),
                depth+1,
                (offset+1) % sizeof(long))
        :
        val;
}

unsigned long constexpr operator "" _attr(char const * ls, std::size_t n){
    return attrID3(ls);
}


int main(int argc, const char * argv[])
{
    const char * test = "Some test text here";
    unsigned long a,b,c,d,e,f;
    char test2[] = "meh";
    a = attrID2(test);
    b = attrID3(test);
    c = attrID2(test2);
    d = attrID3(test2);
    test2[1] = 'a';
    e = attrID2(test2);
    f = attrID3(test2);
    
    cout << hex;
    cout << a << endl;
    cout << b << endl;
    cout << c << endl;
    cout << d << endl;
    cout << e << endl;
    cout << f << endl;
    return 0;
}